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/**
* SAMPLOG.C -- SAMP trace and logging interface.
*
* @file sampLog.c
* @author Mike Fitzpatrick
* @date 6/10/09
*
* @brief SAMP trace and logging interface.
*
*/
/*****************************************************************************/
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include "samp.h"
#define SZ_FMTSPEC 25 /* max size single format spec */
#define EOS 0
#define T_INT 0 /* the only types we support */
#define T_DOUBLE 1
#define T_CHAR 2
/* Private methods.
*/
static void samp_encodeString (char *buf, char *format, va_list *argp);
static char *samp_doarg (va_list **argp, int dtype);
static char *logtime ();
/**
* SAMPLOG -- SAMP message logger.
*
* @brief SAMP message logger.
* @fn sampLog (handle_t handle, char *format, ...)
*
* @param handle SAMP handle
* @param format message format string
* @return nothing
*/
void
sampLog (handle_t handle, char *format, ...)
{
Samp *sampP = samp_H2P (handle); /* get struct pointer */
char *buf;
int len;
va_list argp;
va_start (argp, format); /* encode as a single string */
buf = calloc (1, (4 * SZ_LINE) );
(void) samp_encodeString (buf, format, &argp);
va_end (argp);
len = strlen (buf); /* ensure a newline */
if (strcmp ("\n", &buf[len-1]))
strcat (buf, "\n");
if (sampP->logfd)
fprintf (sampP->logfd, "[%s] %s", logtime(), buf);
if (sampP->debug)
fprintf (stderr, "[%s] %s", logtime(), buf);
if (buf) free ((void *) buf);
}
/**
* SAMPTRACE -- SAMP tracer.
*
* @brief SAMP tracer.
* @fn sampTrace (handle_t handle, char *format, ...)
*
* @param handle SAMP handle
* @param format message format string
* @return nothing
*/
void
sampTrace (handle_t handle, char *format, ...)
{
Samp *sampP = samp_H2P (handle); /* get struct pointer */
char *buf;
int len;
va_list argp;
if (!sampP->trace)
return;
va_start (argp, format); /* encode as a single string */
buf = calloc (1, (4 * SZ_LINE) );
(void) samp_encodeString (buf, format, &argp);
va_end (argp);
len = strlen (buf); /* ensure a newline */
if (strcmp ("\n", &buf[len-1]))
strcat (buf, "\n");
fprintf (stderr, "[%s] %s", logtime(), buf);
if (buf) free ((void *) buf);
}
/**************************************************************************
* Private Methods
*************************************************************************/
/**
* SAMP_ENCODESTRING -- Process the format to the output file, taking arguments
* from the list pointed to by argp as % format specs are encountered in
* the input.
*
* @fn samp_encodeString (char *buf, char *format, va_list *argp)
*
* @param buf formatted output buffer
* @param format format string
* @param argp variable-length arguments
* @return
*/
static void
samp_encodeString (char *buf, char *format, va_list *argp)
{
register int ch; /* next format char reference */
char formspec[SZ_FMTSPEC]; /* copy of single format spec */
char *fsp; /* pointer into formspec */
char cbuf[10];
int done; /* one when at end of a format */
int nch = SZ_LINE; /* one when at end of a format */
while ((ch = *format++) && nch > 0) {
if (ch == '%') {
fsp = formspec;
*fsp++ = ch;
done = 0;
while (!done) {
ch = *fsp++ = *format++;
switch (ch) {
case EOS:
--format;
done++;
break;
case 'l':
fsp--; /* arg size modifier; ignored for now */
break;
case 'b': /* nonstandard UNIX */
case 'c':
case 'd':
case 'o':
case 'x':
case 'u':
*fsp = EOS;
strcat (buf, samp_doarg (&argp, T_INT));
done++;
break;
case 'E': /* ANSI emulation */
*(fsp-1) = 'e';
goto rval;
case 'G': /* ANSI emulation */
*(fsp-1) = 'g';
goto rval;
case 'e':
case 'f':
case 'g':
rval:
*fsp = EOS;
strcat (buf, samp_doarg (&argp, T_DOUBLE));
done++;
break;
case 's':
*fsp = EOS;
strcat (buf, samp_doarg (&argp, T_CHAR));
done++;
break;
}
}
} else {
memset (cbuf, 0, 10);
sprintf (cbuf, "%c", ch);
strcat (buf, cbuf);
}
nch = SZ_LINE - strlen (buf); /* prevent overflow */
}
}
/**
* SAMP_DOARG -- Encode a single argument acording to the data type.
*
* @fn static char *samp_doarg (va_list **argp, int dtype)
*
* @param argp argument list
* @param dtype data type
*
*/
static char *
samp_doarg (va_list **argp, int dtype)
{
int ival;
double dval;
char *cptr;
static char val[128];
/* Pass the data value to be encoded, bump argument pointer by the
** size of the data object. If there is no data value the case
** is a no-op.
*/
memset (val, 0, 128);
switch (dtype) {
case T_INT:
ival = va_arg ((**argp), int);
sprintf (val, "%d", ival);
break;
case T_DOUBLE:
dval = va_arg ((**argp), double);
sprintf (val, "%g", dval);
break;
case T_CHAR:
cptr = va_arg ((**argp), char *);
sprintf (val, "%s", cptr);
break;
}
return (val);
}
/**
* LOGTIME - Generate a time string for the log.
*
* @fn static char *logtime()
*/
static char *
logtime ()
{
time_t t = time (NULL);
struct tm *tm = gmtime (&t);
static char tstr[128];
memset (tstr, 0, 128);
strftime (tstr, 128, "%m%d %T", tm);
return (tstr);
}
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